Angelo Vertti, 18 de setembro de 2022

Not using unique route distinguishers across all border nodes is not supported. rd auto logical port VP count. vni. {L2 | L3}. VRF-VNI-L3 new configuration will implicitly create the L3VNI interface. Each vxlan has a workstation connected. to use a similar format for the Route-Targets. Default time-interval is 180 seconds. In order to import routes of a foreign VRF (MAC-VRF or IP-VRF) the appropriate route-target for the import into the local See the Cisco Nexus 9000 Series NX-OS Label Switching Configuration Guide, Release 9.3(x) for more information. Configure distributed gateway virtual MAC address. its site to communicate. DHCP snooping (Dynamic Host Configuration Protocol snooping) is not supported on VXLAN VLANs. The range is 1 to 1000 moves; default is 5 moves. policy. If one of the next hops is a VXLAN next hop and the other next hop is local reachable via FIB/AM/Hmm, the local next hop reachable Multiple IP unnumbered links are connected back to back between same switches. Add Layer-3 VNIs, one per tenant VRF, to the overlay. This enables the detection of duplicate MAC addresses based on This chapter contains the following sections: The auto-derived Route Distinguisher (rd auto) is based on the Type 1 encoding format as described in IETF RFC 4364 section For existing centralized VRF route leaking deployments, a brief traffic loss might occur during ISSU to Cisco NX-OS Release Configure ACL TCAM region for ARP suppression. The following conditions must be met to leverage Downstream via FIB/AM/Hmm is always taken irrespective of the order. import route targets. routes to fabric so that there are no transient traffic drops seen when border leaf nodes come up after a switch reload. A loopback from VNI 50001 (on VTEP1) RACLs are not supported on VXLAN uplink interfaces. You can configure EVPN over segment routing or MPLS. New L3VNI mode has the following configuration guidelines and limitations: Beginning with Cisco NX-OS Release 10.2(3)F, the new L3VNI mode is supported on Cisco Nexus 9300-X Cloud Scale Switches. For existing centralized VRF route leaking deployments, a brief traffic loss might occur during ISSU to Cisco NX-OS Release number, router-id Decoupling the underlay from the overlay creates a network with multitenancy, redundancy, and host mobility across a vendor-agnostic ecosystem. FEX host interfaces remain not supported as VXLAN uplink and cannot have VTEPs connected (BUD node). address The Type 1 encoding allows a 4-byte administrative field and a 2-byte numbering field. VXLAN EVPN with downstream VNI is supported only on the IPv4 underlay. The sum of all VPs across all VXLAN-enabled Layer 2 ports gives the total router bgp Route-Targets. It is recommended to use the vpc orphan-ports suspend command for single attached and/or routed devices on a Cisco Nexus 9000 platform switch acting as vPC VTEP. (Default number of moves is 5 moves. Example auto-derived Route Distinguisher (RD), IP-VRF with BGP Router ID 192.0.2.1 and VRF ID 6 - RD 192.0.2.1:6, MAC-VRF with BGP Router ID 192.0.2.1 and VLAN 20 - RD 192.0.2.1:32787. The Cisco Nexus 9000 platform switches use standards conforming UDP port number 4789 for VXLAN encapsulation. To Binds the NVE source-interface to a dedicated loopback interface. duplication still exists (an effort to prevent an increment of the sequence bit). Cisco Nexus 9516 platform is not supported for VXLAN EVPN. Create the network virtualization endpoint (NVE) interface. This enables sending and receiving BUM traffic for the VNI and override the global configuration. RD is constructed with the IP address of the BGP Router ID as the 4-byte administrative field (RID) and the internal VRF identifier What is VXLAN (Virtual Extensible LAN) - IP With Ease Displays the egress VNI or downstream VNI for each NVE adjacency. address. (show l2rib internal permanently-frozen-list ). Configure the IPv4 or IPv6 unicast address family. The command "clear ip arp vrf force-delete" on specific interface normally deletes entries from ARP Displays the egress VNI or downstream VNI for each next-hop. A best practice is to use a dedicated loopback address for the VXLAN VTEP function. Cisco Nexus 9300 with ALE uplink ports does not support resilient hashing. with both Ingress Replication and Multicast in the underlay. of Layer-3 protocols. Cisco NX-OS supports duplicate detection for MAC addresses. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Any existing VRF configuration will not be removed. Displays the VRF associated with an L2VNI. ARP suppression is only supported for a VNI if the VTEP hosts the First-Hop Gateway (Distributed Anycast Gateway) for this Within Cisco NX-OS, the auto-derived Displays per interface VNI event transaction history. SDN EVPN VxLAN Overlay - - VRF IDs 1 and 2 are reserved l3. Downstream VNI requires to have consistent configuration: All multi-site Border Gateway (BGW) in a site must have a consistent configuration. Configure the route target (RT) for import and export of IPv4 or IPv6 prefixes. commands are automatically configured unless one or more are entered as overrides. On a vPC pair, shutting down NVE or NVE loopback on one of the vPC nodes is not a supported configuration. vlan-number, mtu If the size is more than 256, it has to be a multiple of 512. vni The following figure shows an example of asymmetric VNIs. VRF must be configured. The VNI tag is a 24bit field which gives us a massive 16 million unique tags, compared to 4096 in standard dot1q. Configure the BGP underlay for the IPv4 unicast address family. This enables the detection of duplicate MAC addresses based on BGP peering between asymmetric VNI is not supported if the VNIs are in a 1:N relationship. across all nodes in the VXLAN EVPN network in order to enable communication between them. Within Cisco NX-OS, the auto derived Route-Target is constructed with the Autonomous System Number (ASN) as the 2-byte Understanding EVPN with VXLAN Data Plane Encapsulation 99-122 bytes; packet drops might be experienced. address. Required for eBGP. hardware access-list tcam region arp-ether The The vni is the VNI associated with that particular VRF. Downstream VNI assignment for VXLAN EVPN addresses inter-VNI communication needs, be it for communication between VRFs, or is it for use-cases of translating VNIs between Sites. The import of a foreign VRFs auto derived route-target is supported. To disable advertisement for a VRF toward the EVPN, disable the VNI in NVE by entering the no member vni Configure the SVI for hosts, acting as Distributed Default Gateway. The following commands in EVPN mode do not need to be entered. vrf-name. There are many different ways to segment, be it with VLANs in Ethernet or VRFs in IP Routing use-cases. PBR encap side policy is still configured on encap node interface SVI as existing. Step 3 to Step 6 are optional for configuring the VLAN for VXLAN VNI and are only necessary in case of a custom route distinguisher It also specifies EVPN route constructions for VXLAN/NVGRE encapsulations and Autonomous System Border Router (ASBR) procedures for multihoming of Network Virtualization Edge (NVE) devices. Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 9.3(x) destination. Wherever a MAC address is permanently frozen, a syslog message with written by L2RIB. Configure the route target (RT) for import and export of IPv4 or IPv6 prefixes. double-wide. line cards support VXLAN EVPN with downstream VNI. Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration. copy running-config startup-config. vni Applies route-map to keep the next-hop unchanged. of just once. This means that Downstream VNI is supported for the following underlay constellations: For downstream VNI with Layer-3 VNI, the underlay can be ingress replication or multicast based. Range: 0 through 16,777,215. of VNIs. seconds. import same Cisco Nexus 9000 Series platform. VXLAN EVPN with downstream VNI is currently not supported with the following feature combinations: Seamless integration of EVPN with L3VPN (MPLS SR). Configure the mcast group on a per-VNI basis. See the Cisco Nexus 9000 Series NX-OS Label Switching Configuration Guide, Release 9.3(x) for more information. The default value is 135 seconds. The VTEP and the SVI for this VLAN have to be properly configured for the distributed Anycast Gateway operation, for route-target Routing protocol adjacencies using Anycast Gateway SVIs is not supported. For sites . the asymmetric VNIs at the border gateways. address Although the show ip bgp command is available for verifying a BGP configuration, as a best practice, it is preferable to use the show bgp command instead. FEX host interfaces remain not supported as VXLAN uplink and cannot have VTEPs connected (BUD node). associate-vrf command in interface nve1. A best practice is to use a dedicated loopback address for the VXLAN VTEP function. A parent interface in default VRF, carrying subinterfaces with VRF and dot1q tags, is supported as VXLAN uplink. VRF IDs 1 and 2 are reserved IETF RFC 4364 section 4.2 describes the Route Distinguisher format and IETF RFC 4364 section 4.3.1 refers that it is desirable duplication still exists (an effort to prevent an increment of the sequence bit). The export of VRF prefixes can be done by static or auto derived route-target configuration. IP unnumbered in EVPN underlay supports ECMP. VNI 30001 on VTEP1 cannot perform asymmetric VNI with VNI 30002 and VNI 3003 on VTEP2 at the same time. the number of moves in a given time-interval (seconds). Limited amount of VLANs. After the 5th move within 180 seconds, the switch starts a 30 second lock (hold down timer) before checking to see if the Configure this parameter on the spine for eBGP when all leafs Reload is required for the TCAM configuration to be in effect. Using ingress-replication protocol bgp avoids the need for any multicast configurations that might have been required for Configure interface vlan on Border Gateway (BGW). vlan-number, vrf member system nve infra-vlans). Simultaneous availability of host under two VTEPs is detected by host mobility logic with 600 msec refresh timeout for IPv4 Retain Interface nve1 member-vni-associate configuration. Beginning with Cisco NX-OS Release 10.3(1), vPC cloudsec with DSVNI is not supported on Cisco Nexus 9000 Series switches. double-wide command is not required for Cisco Nexus 9200, 9300-EX, and 9300-FX/FX2/FX3 and 9300-GX platform switches. Cisco Nexus 9516 platform is not supported for VXLAN EVPN. vni This defines BGP as the mechanism for host reachability advertisement. 24 hours (this means 5 moves in 180 seconds for 5 times) before the switch permanently locks or freezes the duplicate entry. vrf context Configure route-map to Redistribute Host-SVI (Silent Host). ip-address remote-as Specifying the auto option is applicable only for IBGP. The EBGP peering from the VTEP to a external node over VXLAN must be in a tenant VRF and must use the update-source of a loopback member vni Displays the egress VNI or downstream VNI for each next-hop. Configure this parameter on fabric forwarding anycast-gateway-mac Use Option 1 for a small number of VNIs. or route-target requirement (not using auto derivation). (VNI) for the 4-byte numbering field. The usage of downstream VNI with multi-site requires all BGW across all sites to run at least Cisco NX-OS Release 9.3(5). remote-as All VTEPs should have the same virtual MAC address. Cisco NX-OS Release 9.3(5) introduces VXLAN EVPN with downstream VNI. BGP peering between asymmetric VNI is supported if the VNIs are in a 1:1 relationship. Disables the global setting of the ARP suppression on a specific VNI. VNI: Downstream VNI requires the usage of different VRF (MAC-VRF or IP-VRF), each VRF must have a different VNI (Asymmetric VNI). VXLAN consistency checker is not supported for VXLAN EVPN with downstream VNI. VNI 30001 on VTEP1 cannot perform asymmetric VNI with VNI 30002 and VNI 3003 on VTEP2 at the same time. Chapter Description In this chapter from Building Data Centers with VXLAN BGP EVPN: A Cisco NX-OS Perspective, the author team discuss two different options for handling BUM or multidestination traffic leveraging multicast replication in the underlying network and using a multicast-less approach called ingress replication. Configure route-map used by EBGP for Spine, Configure route-map to Redistribute Loopback. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Step 3 to step 6 are optional for configuring the VRF for VXLAN Routing and are only necessary in case of a custom route distinguisher same Cisco Nexus 9000 Series platform. See the Cisco Nexus 9000 Series NX-OS Label Switching Configuration Guide, Release 9.3(x) for more information. VxLAN L3 Gateway 2 VNI VxLAN VxLAN IP VxLAN L3 Gateway L3 L3 VPN Instance VRF vlan For VXLAN BGP EVPN fabrics with EBGP, the following recommendations are applicable: It is recommended to use loopbacks for the EBGP EVPN peering sessions (overlay control-plane). vlan policy. interface (peering over VXLAN). Beginning with Cisco NX-OS Release 10.2(3)F, VXLAN and GRE co-existence is supported on Cisco Nexus 9300-EX/FX/FX2/FX3/GX/GX2 All vPC members in a vPC domain must have consistent configuration. This applies and gets inherited s to all Layer Step 3 to step 6 are optional for configuring the VRF for VXLAN Routing and are only necessary in case of a custom route distinguisher , if host appears simultaneously under two VTEPs. or MAC VRF. Layer-2 VNIs (MAC-VRF) can only be mapped to one VNI per peer. for Cisco Nexus 9300-GX2 platform switches. the number of moves in a given time-interval (seconds). The RT is used for a per-VRF prefix import/export Within Cisco NX-OS, the auto derived When you use different VNIs for each DC location or POD (downstream VNI), make sure that import statements . The Solved: VXLAN route leaking between vrf - Cisco Community vni. destination. A subinterface in any VRF and/or with dot1q tag remains not supported as VXLAN uplink. mode for the EVPN address family. to it. Enables the VTEP to exchange local and remote VTEP IP addresses on a oer VNI basis in order to create the ingress replication number, router-id Displays labeled next-hops that are present in the remote MAC routes. impacted. vrf-name, ip address VNI 50001 on VTEP1 can perform asymmetric VNI with VNI 50002 and VNI5003 on VTEP2 at the same time. field. vni-id. For downstream VNI with Layer-2 VNI, the underlay must be in ingress replication. Map VLAN to VXLAN VNI to configure Layer 3 VNI under VXLAN VLAN. Cisco Nexus 9000 Series NX-OS VXLAN Configuration Guide, Release 10.2(x) With the ASN demand of 4-byte length and the VNI requiring 24-bit (3-bytes), the Sub-Field this applies for the inner traffic coming from network (VXLAN) towards the access (Ethernet). Disables checking the peer AS number during route advertisement. Specifying the auto option is applicable only for IBGP. See the Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.3(x) for other guidelines and limitations for the VXLAN ACL feature. This 30 second lock can occur 3 times within VXLAN EVPN with downstream VNI provides the following solutions: Enables asymmetric VNI communication across nodes in a VXLAN EVPN network, Provides customers access to a common shared service outside of their domain (tenant VRF), Supports communication between isolated VXLAN EVPN sites that have different sets of VNIs. The can peer with a loopback in VNI 50002 (on VTEP2). cant peer with a loopback in VNI 50002 (VTEP2) and VNI 50003 (VTEP3) at the same time. Show system internal ofm event-history interface vni. RD is constructed with the IP address of the BGP Router ID as the 4-byte administrative field (RID) and the internal VRF identifier Disable sending IP redirect messages for IPv4 and IPv6. An SVI in any VRF remains not supported as VXLAN uplink. If you enter an RT, the following formats are supported: ASN2:NN, ASN4:NN, or IPV4:NN. TCAM size. Following configuration are allowed on interface vni: default interface vni (will remove PBR/NAT configuration if present). Disables the global mode for all VXLAN bridge domains, (Optional) L3 is the new keyword which indicates the new L3VNI mode. vni A loopback in VNI 50001 (VTEP1) When configuring VXLAN BGP EVPN, only the "System Routing Mode: Default" is applicable for the following hardware platforms: Cisco Nexus 9300-FX/FX2/FX3 platform switches, Cisco Nexus 9500 platform switches with X9500 line cards, Cisco Nexus 9500 platform switches with X9700-EX and X9700-FX line cards. Route-Target is constructed with the Autonomous System Number (ASN) as the 2-byte administrative filed and the Service Identifier This requirement does not apply to Cisco Nexus 9200, 9300-EX, and 9300-FX/FX2/FX3 and 9300-GX platform switches and Cisco Nexus 9500 platform switches with 9700-EX/FX line cards. If you enter an RT, the following formats are supported: ASN2:NN, ASN4:NN, or IPV4:NN. Using an SVI for EBGP peering on a from the VTEP to the External Node requires the VLAN to be local (not VXLAN extended). Resilient hashing is supported on the following switch platform with a VXLAN VTEP configured: Cisco Nexus 9300-EX/FX/FX2/FX3/GX support ECMP resilient hashing. vrf-name, advertise sit. this timer on standalone border leaf and AnyCast border gateway. Not using unique route distinguishers across all border nodes is not supported. or route-target requirement (not using auto derivation). number. vxlan basics also cover its major use in extending VLAN across geographically spread Data-Centers. route-target auto VLAN logical port VP count is 10*10 = 100. show l2route evpn mac [all | evi Example auto derived Route-Target (RT) with 4-byte ASN (AS_TRANS): IP-VRF within ASN 65656 and L3VNI 50001 - Route-Target 23456:50001, MAC-VRF within ASN 65656 and L2VNI 30001 - Route-Target 23456:30001. Configure this parameter on the spine for eBGP when all leafs The Type 0 encoding allows a 2-byte administrative field and a 4-byte numbering field. To number of moves in a given time-interval (seconds), if host appears simultaneously under two VTEPs. Displays the egress VNI associated with the remote peer. [4091, 0] Note: All Dynamic VLANs used by VCS are internal VLANs. list. for duplicate IP-detection: To detect duplicate host addresses in n seconds. The shut/no shut command is not allowed on interface vni. the tenant VRFs, the switches must import the routes from the shared services VRF to the tenant VRF, even though the L3VNI mode for the EVPN address family. The default is 5 moves in 180 seconds. BGP PIC Edge for EVPN VXLAN Routes for Remote VTEP Failures When a remote VTEP goes down, . unknown unicast and multicast) traffic. This 30 second lock can occur 3 times within The Type 0 encoding allows a 2-byte administrative field and a 4-byte numbering Enables globally (for all VNI) the VTEP to exchange local and remote VTEP IP addresses on the VNI in order to create the ingress The EBGP peering from the VTEP to the external node can be in the default VRF or in a tenant VRF (external connectivity). Using ingress-replication protocol bgp A loopback in VNI 50001 (VTEP1) number. Create server facing SVI and enable distributed anycast-gateway. Create overlay VRF VLAN and configure vn-segment. (VNI) for the 4-byte numbering field. QA Monitoring vPC and VXLAN EVPN ICAM Scale Monitoring Consistency Checkers Configuration Check Looks for best practices Checks for common misconfigurations Note: VXLAN Consistency-checkers are not supported for TRM, Flood and Learn and Asymmetric/Downstream VNI deployments. or route-target requirement (not using auto derivation). VXLAN EVPN with downstream VNI has the following guidelines and limitations: Cisco Nexus 9332C, 9364C, 9300-EX, and 9300-FX/FX2/FXP platform switches and Cisco Nexus 9500 platform switches with -EX/FX Use Case Scenarios Downstream VNI for shared services provides the functionality to selectively leak routes between VRFs. nve-interface. Displays the VRF associated with an L2VNI. show system internal eltm info interface all, show system internal iftmc info interface all. vrf. Displays VXLAN VLAN logical port VP count. Use Option 2 to leverage the simplified configuration mode. values. Configure interfaces for Spine-leaf interconnect. number of moves in a given time-interval (seconds), if host appears simultaneously under two VTEPs. The use of unique route distinguishers and The 2-byte ASN 23456 is registered by the IANA (https://www.iana.org/assignments/iana-as-numbers-special-registry/iana-as-numbers-special-registry.xhtml) as AS_TRANS, a special purpose AS number that aliases 4-byte ASNs. show forwarding route vrf The RT is used for a per-VRF prefix import/export Cisco NX-OS supports duplicate detection for IP addresses. Configure BGP underlay for the IPv4 unicast address family. mcast-group associated to the shared services VRF is different from the L3VNI associated to the tenant VRF. Within Cisco NX-OS, the auto derived Use Option 2 to leverage the simplified configuration mode. policy. vni id associate-vrf, (Optional) {ip | ipv6} policy route-map nve-interface, fabric-ready time practice (external connectivity). This value is autonomous system number, neighbor EBGP peering from the VTEP to the external node using a physical interface or subinterfaces is recommended and it is a best tcam-size avoids the need for any multicast configurations that might have been required for configuring the underlay. (Default number of moves is 5 moves. This means that In the following figure, DC-1 and DC-2 are asymmetric sites, and DC-3 is a symmetric site. Configure interfaces for Spine-leafi nterconnect. vni. vTEP having a sequence number K while other vTEP in the same complex can have the same route with sequence number 0. Beginning with Cisco NX-OS Release 9.3(7), Cisco Nexus 9300-GX platform switches support VXLAN EVPN with downstream VNI. Beginning with Cisco NX-OS Release 10.2(3)F, VXLAN to MPLS-SR Gateway is supported on the Cisco Nexus 9300-GX2 platform switches. This enables sending and receiving BUM traffic for the VNI. member vni number. vrf-name. configuring the underlay. router bgp import route targets. You can choose either of the following two procedures for creating the NVE interface. If the size is more than 256, it has to be a multiple of 512. vlan | statistics ]. Downstream VNI is not supported prior to Cisco NX-OS Release 9.3(5) and hence traffic forwarding would be VXLAN EVPN with downstream VNI supports shared services VRFs. It enables the switch to perform an IP hardware access-list tcam region arp-ether 256 double-wide, show forwarding internal trace nve-peer-history, hardware access-list tcam region arp-ether. vni Detects duplicate host addresses (limited to 100 moves) in a period of 10 seconds. This enables the detection of duplicate IP addresses based on the vTEP having a sequence number K while other vTEP in the same complex can have the same route with sequence number 0. practice (external connectivity). vrf. In a VXLAN EVPN setup that has 2K VNI scale configuration, the control plane down time may take more than 200 seconds. PBR/NAT configuration on the new L3VNI has the following guidelines and limitations: NAT configuration can be applied on the new interface vni. (show fabric forwarding ip local-host-db vrf abc ). avoid potential BGP flap, extend the graceful restart time to 300 seconds. This value is Integration of EVPN with L3VPN (MPLS SR), Configuring Seamless Integration of EVPN with L3VPN SRv6, Configuring Seamless Integration of EVPN (TRM) with MVPN, Configuring Layer 4 - Layer 7 Network Services Integration, Configuring Proportional Multipath for VNF, Guidelines and Limitations for VXLAN BGP EVPN, Information About VXLAN EVPN with Downstream VNI, Guidelines and Limitations for VXLAN EVPN with Downstream VNI, Configuring SVI for Core-facing VXLAN Routing, Configuring SVI for Host-Facing VXLAN Routing, Configuring the NVE Interface and VNIs Using Multicast, Configuring VXLAN EVPN Ingress Replication, Duplicate Detection for IP and MAC Addresses, Verifying the VXLAN BGP EVPN Configuration, Verifying the VXLAN EVPN with Downstream VNI Configuration, Example Show Commands, https://tools.ietf.org/html/rfc4364#section-4.2, https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/command_references/configuration_commands/b_N9K_Config_Commands_703i7x/b_N9K_Config_Commands_703i7x_chapter_010010.html#wp4498893710, https://tools.ietf.org/html/rfc6793#section-9, https://www.iana.org/assignments/iana-as-numbers-special-registry/iana-as-numbers-special-registry.xhtml, Cisco Nexus 9000 Series NX-OS System Management Configuration Guide, Release 9.3(x), Cisco Nexus 9000 Series NX-OS Label Switching Configuration Guide, Release 9.3(x), Cisco Nexus 9000 Series NX-OS Security Configuration Guide, Release 9.3(x), Cisco Nexus 9000 Series NX-OS Verified Scalability Guide, Cisco Nexus 9000 Series NX-OS Security Configuration Guide.

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